You are here: Home > Saddles and Tack > Bridles & Accessories > Western Headstalls, Bridles & Reins Finn-Tack Automatic Check Coupler Loading... Loading... Stock status: Out of Stock Stock status: In Stock Product Code: HZ11623 Qty: Loading... Description Sizing Information Reviews Stainless Steel automatic check coupler. The sizes correspond to the length of the screw. S=17mm (QH racing harness) M=24mm (other finntack harnesses) Loading...